摘要
在典型的含金～硫化物蚀变带进行激电法勘查时,勘查地球物理学家考虑的因素有:矿化带的厚度和横向范围,覆盖层的厚度和导电性,围岩电阻率,勘探时所选用的电极排列方式和电极距,确定勘探深度也是必要的。轴向单极～偶极排列具有采集的数据量大,激电信号强,穿透深度大,勘探精度高和效率高等优点。图示说明了轴向单极～偶极测深原理和电极排列方式。简述了勘探区地质特征和岩(矿)石电性特征,激电测深二维反演结果表明,三叠系地层版纳组砂岩、细砂岩含金矿段均有明显的中阻～高极化响应特征。经钻探验证,深部IP异常多见金属硫化物含金矿脉,轴向单极～偶极激电测深在勘探区取得了较好的地质效果。
When using induced polarization(IP) method to prospect one typical gold-sulfide alteration band, the main factors for exploration geophysicists to think about are the thickness and the transversal range of the mineralized zone,the thickness and conductivity of the overburden,the resistivity of wall rock and the spaces distances of electrodes and configuration of electrodes to decide the exploration depth.The strongpoint of inline pole-dipole array is that it can obtain massive collection data, strong IP signal, larger penetration depth, highly surveying accuracy and highly working efficiency. The charts of the inline pole-dipole array in this paper shows the sounding principle and the electrodes configuration mode. This paper simply states the geological characteristics and the electricity character of rock (ore) for surveying area.The 2D sounding inversion result shows obvious middle to low resistivity anomalies and high chargeability anomalies in Triassic Banna-Team sandstone and slender sandstone containing gold.On the other hand,the drilling result shows that the deep IP anomalies correspond to the multiple metal-sulfide and gold vein. Very good geological effect has been achieved in applying inline pole-dipole array electric method to the prospecting in the surveying area.
出处
《物探化探计算技术》
CAS
CSCD
2009年第3期202-209,共8页
Computing Techniques For Geophysical and Geochemical Exploration
关键词
激发极化
微细浸染型金矿
轴向单极~偶极
IP异常
测深
地质效果
induced polarization
microscopic disseminated type gold mine
inline pole-dipole
IP anomaly
sounding
geological effects
